﻿using System.Runtime.Remoting.Messaging;
using System.Web;

namespace TSharp.Core.Util
{
    /// <summary>
    /// 
    /// </summary>
    /// <author>
    /// tangjingbo
    /// </author>
    /// <remarks>
    /// tangj15 at 2012-3-16 9:59
    /// </remarks>
    public sealed class LogicalContext
    {
        private LogicalContext()
        {
        }

        /// <summary>
        /// Retrieves an object with the specified name.
        /// </summary>
        /// <param name="name">The name of the item.</param>
        /// <returns>The object in the call context associated with the specified name or null if no object has been stored previously</returns>
        public static object GetData(string name)
        {
            HttpContext ctx = HttpContext.Current;
            if (ctx == null)
            {
                return CallContext.GetData(name);
            }
            else
            {
                return ctx.Items[name];
            }
        }

        /// <summary>
        /// Stores a given object and associates it with the specified name.
        /// </summary>
        /// <param name="name">The name with which to associate the new item.</param>
        /// <param name="value">The object to store in the call context.</param>
        public static void SetData(string name, object value)
        {
            HttpContext ctx = HttpContext.Current;
            if (ctx == null)
            {
                CallContext.SetData(name, value);
            }
            else
            {
                ctx.Items[name] = value;
            }
        }

        /// <summary>
        /// Empties a data slot with the specified name.
        /// </summary>
        /// <param name="name">The name of the data slot to empty.</param>
        public static void FreeNamedDataSlot(string name)
        {
            HttpContext ctx = HttpContext.Current;
            if (ctx == null)
            {
                CallContext.FreeNamedDataSlot(name);
            }
            else
            {
                ctx.Items.Remove(name);
            }
        }
    }
}